INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

The Company had goodwill in the amount of $506,852 and $447,995 as of June 30, 2019 and December 31, 2018, respectively, subject to the provisions of ASC 350, “Intangibles-Goodwill and Other.” The increase in goodwill is primarily the result of the acquisition of Chemogas, partially offset by a reclassification of a portion of the Company's goodwill to assets held for sale of $1,380, with the remaining change due to foreign exchange translation adjustments. Refer to Note 2, "Significant Acquisitions and Divestitures," for more information.

Identifiable intangible assets with finite lives at June 30, 2019 and December 31, 2018 are summarized as follows:



	Amortization Period (in years)	Gross Carrying Amount at 6/30/2019		Accumulated Amortization at 6/30/2019		Gross Carrying Amount at 12/31/2018		Accumulated Amortization at 12/31/2018
Customer relationships & lists	10-20	$	234,252	$	130,598	$	192,185	$	122,545
Trademarks & trade names	2-17	39,681		18,315		39,934		16,755
Developed technology	5-10	13,338		9,840		13,338		8,604
Other	3-18	18,600		7,349		14,913		6,481
		$	305,871	$	166,102	$	260,370	$	154,385

Amortization of identifiable intangible assets was approximately $6,128 and $11,970 for the three and six months ended June 30, 2019, respectively, and $6,279 and $12,472 for the three and six months ended June 30, 2018, respectively. Assuming no change in the gross carrying value of identifiable intangible assets, estimated amortization expense is $13,534 for the remainder of 2019, $24,882 for 2020, $21,151 for 2021, $19,277 for 2022, $17,860 for 2023 and $9,332 for 2024. At June 30, 2019 and 2018, there were no identifiable intangible assets with indefinite useful lives as defined by ASC 350. Identifiable intangible assets are reflected in “Intangible assets with finite lives, net” in the Company’s condensed consolidated balance sheets. There were no changes to the useful lives of intangible assets subject to amortization during the six months ended June 30, 2019 and 2018.